Full-effective reverse osmosis membrane element and water purification machine

Abstract

A full-effective reverse osmosis membrane element and a water purification machine are provided. The reverse osmosis membrane element includes a reverse osmosis membrane (20) and a central tube (10) provided with several water-inlet holes (11). The reverse osmosis membrane (20) is wound around the central tube (10) and covers each water-inlet hole (11) and forms a raw water flow channel. Two sides of the reverse osmosis membrane (20) are sealed by first and second water division bands (21) (22). The first water division band (21) and the central tube (10) form a first concentrated water-outlet (211). The first water division band (21) and the reverse osmosis membrane (20) form a second concentrated water-outlet (212). The second water division band (22) and the reverse osmosis membrane (20) form a first raw water-inlet (221). The second water division band (22) and the central tube (10) form a second raw water-inlet (222).

What is claimed is: 
     
       1. A full-effective reverse osmosis membrane element comprising a central tube and a reverse osmosis membrane folded in half to be wound around the central tube, a raw water flow channel being formed between front surfaces of the reverse osmosis membrane folded in half, two opposite edges on each lateral side of the reverse osmosis membrane folded in half being respectively sealed by a first water division band and a second water division band, a first end of the first water division band and a first end of the central tube being spaced from each other and forming a first concentrated water-outlet, a second end of the first water division band and an end, away from the central tube, of the reverse osmosis membrane being spaced from each other and forming a second concentrated water-outlet, a first end of the second water division band and the end, away from the central tube, of the reverse osmosis membrane being spaced from each other and forming a first raw water-inlet, and a second end of the second water division band and a second end of the central tube being spaced from each other and forming a second raw water-inlet,
 wherein an external hole perimeter of the first concentrated water-outlet accounts for 10%-50% of a length of a longer side of the reverse osmosis membrane, and an external hole perimeter of the first raw water-inlet accounts for 10%-50% of the length of the longer side of the reverse osmosis membrane, such that dead spaces are prevented from being formed in the raw water flow channel. 
 
     
     
       2. The full-effective reverse osmosis membrane element of  claim 1 , wherein the first concentrated water-outlet, the second concentrated water-outlet, and the first raw water-inlet are communicated with the raw water flow channel. 
     
     
       3. The full-effective reverse osmosis membrane element of  claim 1 , wherein the second raw water-inlet is communicated with the raw water flow channel. 
     
     
       4. The full-effective reverse osmosis membrane element of  claim 1 , wherein a distance between the first water division band and the central tube is greater than that between the second water division band and the central tube. 
     
     
       5. The full-effective reverse osmosis membrane element of  claim 1 , wherein a distance between the first water division band and the end, away from the central tube, of the reverse osmosis membrane is less than that between the second water division band and the end, away from the central tube, of the reverse osmosis membrane. 
     
     
       6. The full-effective reverse osmosis membrane element of  claim 1 , wherein the reverse osmosis membrane is rectangular when unfolded, the first water division band and the second water division band respectively seal two longer sides of the reverse osmosis membrane, a short side of the reverse osmosis membrane is attached to the external wall of the central tube. 
     
     
       7. A water purification machine, comprising the full-effective reverse osmosis membrane element of  claim 1 . 
     
     
       8. A full-effective reverse osmosis membrane element comprising a central tube and a reverse osmosis membrane folded in half to be wound around the central tube, a raw water flow channel being formed between front surfaces of the reverse osmosis membrane folded in half, two opposite edges on each lateral side of the reverse osmosis membrane folded in half are respectively sealed by a first water division band and a second water division band, a first end of the first water division band and a first end of the central tube being spaced from each other and forming a first concentrated water-outlet, a second end of the first water division band and an end of the reverse osmosis membrane away from the central tube being spaced from each other and forming a second concentrated water-outlet, a first end of the second water division band and the end of the reverse osmosis membrane away from the central tube being spaced from each other and forming a second raw water-inlet, and a second end of the second water division band and a second end of the central tube being spaced from each other and forming a first raw water-inlet, wherein dead spaces are prevented from being formed in the raw water flow channel. 
     
     
       9. A reverse osmosis membrane assembly comprising a central tube and a reverse osmosing membrane folded in half, wherein two opposite edges on each lateral side of the reverse osmosis membrane folded in half are respectively sealed by a first water division band and a second water division band, a first end of the first water division band and a first end of the central tube are spaced from each other and form a first concentrated water-outlet, a second end of the first water division band and an end, away from the central tube, of the reverse osmosis membrane are spaced from each other and form a second concentrated water-outlet, a first end of the second water division band and the end, away from the central tube, of the reverse osmosis membrane are spaced from each other and form a first raw water-inlet, and a second end of the second water division band and a second end of the central tube are spaced from each other and form a second raw water-inlet,
 wherein an external hole perimeter of the first concentrated water-outlet accounts for 10%-50% of a length of a longer side of the reverse osmosis membrane, and an external hole perimeter of the first raw water-inlet accounts for 10%-50% of the length of the longer side of the reverse osmosis membrane, such that flow dead spaces of the raw water are prevented. 
 
     
     
       10. The reverse osmosis membrane assembly according to  claim 9 , wherein the first concentrated water-outlet, the second concentrated water-outlet, the first raw water-inlet, and the second raw water-inlet are communicated with a raw water flow channel.